<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
      <!-- tab区域 -->
        <el-tabs v-model="activeIndex"
                 tab-position="left"
                 :before-leave="beforeTabLeave"
                 @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                  v-model="addForm.goods_cat"
                  :options="cateList"
                  :props="cateProps"
                  @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb , i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!--   action 表示图片要上传到后台的API地址    -->
<!--            :on-success="handleSuccess"-->
            <el-upload
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                :headers="headerObj" >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">

          </el-tab-pane>
        </el-tabs>

      </el-form>
    </el-card>
  </div>
</template>

<script>
export default {
  name: "Add",
  data() {
    return{
      activeIndex: '0',

      // 添加商品数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: []

      },
      // 添加商品验证规则
      addFormRules: {
        goods_name: [
          {required: true, message: '请输入商品名称', trigger: 'blur'},
        ],
        goods_price: [
          {required: true, message: '请输入商品价格', trigger: 'blur'},
        ],
        goods_weight: [
          {required: true, message: '请输入商品重量', trigger: 'blur'},
        ],
        goods_number: [
          {required: true, message: '请输入商品数量', trigger: 'blur'},
        ],
        goods_cat: [
          {required: true, message: '请选择商品分类', trigger: 'blur'}
        ]
      },

      //商品分类列表
      cateList: [],

      // 级联选择框的配置对象
      cateProps:{
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children:'children',
      },
      // 动态参数列表数据
      manyTableData:[],
      // 静态参数列表数据
      onlyTableData:[],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/',

      // 图片上传组件的heaters请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片的数组
      pics: []
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList() {
      const {data: res} = await this.$http.get('categories',)
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      console.log(res);
      // 把数据列表赋值给 cateList
      this.cateList = res.data
    },
    // 级联选择器，发生变化触发这个函数
    handleChange() {
      console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length !== 3 ){
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      //console.log('即将离开的标签页名字是:' + oldActiveName)
      //console.log('即将进入的标签页名字是:' +activeName)
      // return false   // 返回作用：阻止进入下一标签

      if (oldActiveName ==='0' && this.addForm.goods_cat.length !== 3){
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked() {
      // console.log(this.activeIndex)
      // 证明访问的是动态参数面板
      if(this.activeIndex === '1') {
        const {data: res} = await this.$http.get(
            `categories/${this.cateId}/attributes`,
            {params: {sel: 'many'}})

        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败')
        }
        console.log(res.data);
        // 在赋值之前，将res.data中的attr_val分割成数组并循环，循环结果再赋值给 item.attr_val -->item 是别名
        res.data.forEach(item => {
          // item.attr_vals 不为空就进行分割，否则就赋值为空数组
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          this.manyTableData = res.data
        })
      }
      else if (this.activeIndex === '2'){
        const {data: res} = await this.$http.get(
            `categories/${this.cateId}/attributes`,
            {params: {sel: 'only'}})

        if (res.meta.status !== 200) {
          return this.$message.error('获取静态参数列表失败')
        }
        console.log(res.data);
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview() {},
    // 处理图片移除操作
    handleRemove() {

    },
    //监听图片上传成功的事件
    // handleSuccess(response){
    //   console.log(response)
    //   // 1．拼接得到一个图片信息对象
    //   // const picInfo = { pic: response.data.tmp_path }
    //   // 2．将图片信息对象，push 到pics数组中
    //   // this.addForm.pics.push(picInfo)
    //   console.log(this.addForm)
    // }
},

  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3){
          return this.addForm.goods_cat[2]
      }return null
    }
  }
}
</script>

<style scoped>
.el-steps{
  margin: 15px 0;
}
.el-checkbox{
  margin: 0 5px 0 0 !important;
}

</style>